Experts: 401(k) rules may cause headaches for advisers and sponsors

Certain provisions of the U.S. Labor Department's new 401(k) rules might trip up plan sponsors and advisers who don't tread carefully, experts say. Among them: Declaring "indirect compensation," such as free tickets to events; rules that let advisers estimate fees; and a requirement that advisers detail the history of any asset-allocation models they use for 401(k) plans.